Standalone

Architecture

Redis standalone is a single process-based redis pod that can manage your keys inside it. Multiple applications can consume this redis with a Kubernetes endpoint or service. Since this standalone setup is running inside Kubernetes, the auto-heal feature will be automatically part of it. The only drawback of a standalone setup is that it doesn’t stand on the high availability principle.

Helm Installation

In redis standalone mode, we deploy redis as a single StatefulSet pod that means ease of setup but no complexity, no high availability, and no resilience.

Installation can be easily done via helm command:

$ helm install redis ot-helm/redis --namespace ot-operators
...
Release "redis" does not exist. Installing it now.
NAME:          redis
LAST DEPLOYED: Sun May  2 15:59:48 2021
NAMESPACE:     ot-operators
STATUS:        deployed
REVISION:      1
TEST SUITE:    None

Verify the standalone redis setup by kubectl command line.

$ kubectl get pods -n ot-operators
...
NAME                              READY   STATUS    RESTARTS   AGE
redis-standalone-0                2/2     Running   0          56s

YAML Installation

Examples folder has different types of manifests for different scenarios and features. There are these YAML examples present in this directory:

• additional_config
• advance_config
• affinity
• disruption_budget
• external_service
• password_protected
• private_registry
• probes
• redis_monitoring
• tls_enabled
• upgrade_strategy

A basic sample manifest for standalone redis:

---
apiVersion: redis.redis.opstreelabs.in/v1beta1
kind: Redis
metadata:
  name: redis-standalone
spec:
  kubernetesConfig:
    image: quay.io/opstree/redis:v7.0.5
    imagePullPolicy: IfNotPresent
  storage:
    volumeClaimTemplate:
      spec:
        # storageClassName: standard
        accessModes: ["ReadWriteOnce"]
        resources:
          requests:
            storage: 1Gi
  securityContext:
    runAsUser: 1000
    fsGroup: 1000

The yaml manifest can easily get applied by using kubectl.

$ kubectl apply -f standalone.yaml